Yeah thats what I did tell sheva to follow you the hole time, maybe if jill gets in the way try an knock her out but sometimes all you can do is hold her which is not a clever thing to do if your partner aint close by because it makes you open to wesker an he will knock you lol. but you can shoot weskers back sometimes I like using inf ammo an showering him in M93R bullets lol none of them ever hit but its well funny.... but try to get enough headshots on him when hes got his back turned I think it makes the fight slower Im not sure
dont really know what to do on that fight I just run off.. people online seem to do the smae thing that an shooting wesker in the head.